Made an offer on a property, what do I do now?

It's a lock up near to us. They don't come up very often so we offered 9am the day after it went on. That was Wed last week.They said offers in excess of X. And we offered X , expecting to go higher. I spoke to EA on Thurs who said the buyer was seeing if there was any other offers. Which we expected. But we expected there to have been more by now. Last year one went for 20% more after 3 days.My parents are saying up the offer slightly & get them to take it off. Dh says wait. WWYD?